1. Drive immediately to a suitably quali-
fied workshop without switching o the
engine and ha
ve the system checked.
AdBlue
®
l
evel too low
The warning lamp lights up red.
A text message may also be displayed.
It is not possible to start the engine be-
cause the AdBlue
®
level is too low.
1. Park the vehicle.
2.
Refill the minimum quantity of AdBlue
®
→ page 301.
or Selective catalytic re-
duc
tion system fault
The indicator lamps light up yellow or
white.
A text message may also be displayed.
There is a fault in the selective catalytic re-
duction system or the system is not filled
with standard-compliant AdBlue
®
.
1. Drive immediately to a suitably quali-
fied workshop and have the system
checked.
Or:
During prolonged spells of cold weather
with temperatures below -11°C (+13°F),
and in extremely adverse conditions, it is
possible that the AdBlue® cannot be de-
frosted and is not available for the emis-
sion control system.
1. Drive the vehicle to a warmer environ-
ment with an ambient temperature
higher than -11°C (+13°F) within the
stated range, e.g. a garage.
The error message disappears if there is
sucient AdBlue
®
and it has defrosted.
or SCR system fault
T
he indicator lamps light up yellow or
white.
A text message may also be displayed.
There is a fault in the selective catalytic re-
duction system or the system is not filled
with standard-compliant AdBlue
®
.
1. Drive immediately to a suitably quali-
fied workshop and ha
ve the system
checked.
Or:
During prolonged spells of cold weather
with temperatures below -11°C (+13°F),
and in extremely adverse conditions, it is
possible that the AdBlue® cannot be de-
frosted and is not available for the emis-
sion control system.
1. Drive the vehicle to a warmer environ-
ment with an ambient temperature
higher than -11°C (+13°F) within the
stated range, e.g. a garage.
The error message disappears if there is
sucient AdBlue
®
and it has defrosted.
Catalytic converter
Please refer to at the start of the
chapt
er on page 299.
Observe the following information to help
ensure the long-term functionality of the
exhaust system and the catalytic converter
in the petrol engine:
— Only refuel with fuels that are suitable
for the vehicle → page 294.
— Do not run the fuel tank empty.
— Do not refill too much engine oil
→ page 334.
— Do not tow-start the vehicle. Use jump
leads.
If you notice misfiring, loss of power or un-
even running when driving, reduce speed
immediately and have the vehicle checked
by a suitably qualified workshop. If this
happens, unburnt fuel can enter the ex-
haust system and escape into the atmos-
phere. The components relevant to emis-
sion control can be damaged by overheat-
ing.
The emissions may have a sulphur-
like smell even if the emission purifi-
cation system is working properly.
Emission control 303
2KF012720AE
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